by my rough calculations 14/46 should get you close enough to stock gearing with a 160/60r16 rear wheel.

Stock dirt gearing is pretty much spot on for street use at legal speeds, ie 0-100kph.

Any taller you will lose power.

Any shorter you won't really gain acceleration as the 6 speed gear box is already low in the first few gears. Plus the gears will feel too close and it will be difficult to keep the front end down. Wheelies are fun but your steering and braking performance comes from the front wheel. You don't want to too light in the corners.

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"A motorcycle is a bicycle with a pandemonium attachment, and is designed for the special use of mechanical geniuses, daredevils and lunatics."

by my rough calculations 14/46 should get you close enough to stock gearing with a 160/60r16 rear wheel.

Stock dirt gearing is pretty much spot on for street use at legal speeds, ie 0-100kph.

Any taller you will lose power.

Any shorter you won't really gain acceleration as the 6 speed gear box is already low in the first few gears. Plus the gears will feel too close and it will be difficult to keep the front end down. Wheelies are fun but your steering and braking performance comes from the front wheel. You don't want to too light in the corners.

So the 14/45 combo I have on now sounds about right
Unfortunately I have to wait another week until
I'm home again to test on faster roads and go from there
I have a spare 13 for the front that came with the bike I might put that on as well to compare the difference

I can't comment much westaussie yet I would say that if you're used to 14 on the front then you should stay & stick with that.
Very broadly speaking 14/48 is 1 in 4 so 1 on the front is worth 4 on the back & vice-versa: It's merely Yin & Yang kinda ratios.

Changing the rear sprocket size costs you the price of the rear sprocket (maybe)... but a small front sprocket is wrecked pretty quick along with your chain & likely resulting in both of your sprockets wrecked as-well... costs you both... triple actually... if & when you'd count all those sums.

I'd try to stay with the 14t front if I could & I'd then try to suss the maths as to what the rear sprocket size ought to be:-
14/56 is akin to 4:1. 14/42 is akin to 3:1. So that difference of 14 equates to about a quarter difference in between those.

Any shorter you won't really gain acceleration as the 6 speed gear box is already low in the first few gears. Plus the gears will feel too close and it will be difficult to keep the front end down. Wheelies are fun...

Gearing has no effect whatsoever on power WA, it lowers torque at the road wheel. And... ALL the fun of SM bikes is lifting the wheel in every gear. if they're geared too long you can't steer the bike with the rear, very boring.
It's not a Harley FFS, get into it.

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Gearing has no effect whatsoever on power WA, it lowers torque at the road wheel. And... ALL the fun of SM bikes is lifting the wheel in every gear. if they're geared too long you can't steer the bike with the rear, very boring.
It's not a Harley FFS, get into it.

That's why I've converted for fun on the road and a odd track day
Already have a R1 so not worried about going very high speed on the sm it's more of a fun bike , when I get back from work next week I will put my dirt combo on and see how that goes on the sm setup